зеркало из https://github.com/mozilla/gecko-dev.git
64 строки
2.6 KiB
ReStructuredText
64 строки
2.6 KiB
ReStructuredText
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Layers History
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==============
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This is an overview of the major events in the history of our Layers
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infrastructure.
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- iPhone released in July 2007 (Built on a toolkit called LayerKit)
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- Core Animation (October 2007) LayerKit was publicly renamed to OS X
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10.5
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- Webkit CSS 3d transforms (July 2009)
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- Original layers API (March 2010) Introduced the idea of a layer
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manager that would composite. One of the first use cases for this was
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hardware accelerated YUV conversion for video.
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- Retained layers (July 7 2010 - Bug 564991) This was an important
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concept that introduced the idea of persisting the layer content
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across paints in gecko controlled buffers instead of just by the OS.
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This introduced the concept of buffer rotation to deal with scrolling
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instead of using the native scrolling APIs like ScrollWindowEx
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- Layers IPC (July 2010 - Bug 570294) This introduced shadow layers and
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edit lists and was originally done for e10s v1
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- 3D transforms (September 2011 - Bug 505115)
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- OMTC (December 2011 - Bug 711168) This was prototyped on OS X but
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shipped first for Fennec
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- Tiling v1 (April 2012 - Bug 739679) Originally done for Fennec. This
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was done to avoid situations where we had to do a bunch of work for
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scrolling a small amount. i.e. buffer rotation. It allowed us to have
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a variety of interesting features like progressive painting and lower
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resolution painting.
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- C++ Async pan zoom controller (July 2012 - Bug 750974) The existing
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APZ code was in Java for Fennec so this was reimplemented.
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- Streaming WebGL Buffers (February 2013 - Bug 716859) Infrastructure
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to allow OMTC WebGL and avoid the need to glFinish() every frame.
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- Compositor API (April 2013 - Bug 825928) The planning for this
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started around November 2012. Layers refactoring created a compositor
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API that abstracted away the differences between the D3D vs OpenGL.
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The main piece of API is DrawQuad.
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- Tiling v2 (Mar 7 2014 - Bug 963073) Tiling for B2G. This work is
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mainly porting tiled layers to new textures, implementing
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double-buffered tiles and implementing a texture client pool, to be
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used by tiled content clients.
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A large motivation for the pool was the very slow performance of
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allocating tiles because of the sync messages to the compositor.
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The slow performance of allocating was directly addressed by bug 959089
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which allowed us to allocate gralloc buffers without sync messages to
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the compositor thread.
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- B2G WebGL performance (May 2014 - Bug 1006957, 1001417, 1024144) This
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work improved the synchronization mechanism between the compositor
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and the producer.
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